Several events have marked the bicentenary of John Snow’s birth (March 15 1813), including a day-long meeting in York, Snow’s birthplace, and a special session of the American Epidemiological Society. The biggest celebrations were held in London: two international meetings on the Legacy of John Snow and an art exhibition on disease mapping, all at the London School of Hygiene and Tropical Medicine, sponsored by the John Snow Society (as well as the Wellcome Trust, The Bill and Melinda Gates Foundation, the International Epidemiological Association, the UK Arts Council, the History Centre of the LSHTM, and LSHTM), and supported by RSPH. The programme helps navigate the many exciting events and eminent speakers.